Note: The `sort_title` in these examples is wrapped in quotes because it contains a character [`!`] which has syntactic meaning in YAML files. This "quoting special characters" is a general YAML requirement, not something specific to `sort_title`.
Note: The `sort_title` in these examples is wrapped in quotes because it contains a character [`!`] which has [syntactic meaning in YAML files](../home/guides/yaml.html#string-literals). This "quoting special characters" is a general YAML requirement, not something specific to `sort_title`.